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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '840f7c0c58d0823b1b26ff2da630c75a3f0eb0627d3d1e73a347ee3ee7e59383' 
  AND token = 'eexvsxi6vn+8oXtsHMxCGigT5sY+jgOWLFS2tc6j82Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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