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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10f3908b5d601d9e50e1e2e93432fe5d0fda23331ef4d8b0ac1d1508782270b6' 
  AND token = 'irBohPOdgQRhDKLnUn4qsz2j0vyiSPh1t7pz6Urk3wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}