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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d2262c4f4477f5e18ea11e1e8b60004e7e6fa98be5910d7d58db9f722ea7afb' 
  AND token = 'wRL+mvt1qaWJIHeB3Xs78plvcFCs6QPmBOEE00vdCRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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