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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5393c17bb4e0ef659a7724bad6b4543890591b3dd227d54ded8788067d6a434' 
  AND token = 'EEeg2dXwvts8nfC6ezemPLoS7zoLA9ZjoGkV5R+qczk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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